S7021 ACD/P4ATBTB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7021 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
4.82 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.004mm to 0
Width
78 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
17.462 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
61875 lbf
Limiting speed
10 X 1000 rpm
Lubrication
Grease
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S7021 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The S7021 ACD/P4ATBTB is a precision angular contact ball bearing configured in a Triplex Back-to-Back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing excels at handling combined loads (radial and axial) simultaneously. Its P4A tolerance class ensures superior running accuracy, while the light preload (Class B) minimizes deflection under operational stresses, making it ideal for high-precision, high-reliability machinery.
S7021 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class, superior to ABEC 7. |
| TBT | Specifies a Triplex Back-to-Back arrangement of three matched bearings. |
| (Sealed) | Integrated seals for contamination protection and lubricant retention. |
| (Grease) | Pre-lubricated with grease suitable for the specified temperature range. |
S7021 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The Triplex Back-to-Back (TBT) configuration provides exceptional system rigidity, effectively resisting moment loads and minimizing shaft deflection under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and a robust design featuring 21 balls, this bearing offers high radial dynamic load rating of 44,775 lbf and a radial static load rating of 61,875 lbf.
- Precision & High-Speed Capability: The P4A tolerance class guarantees precise running, while the phenolic cage contributes to smooth operation and is suitable for high-speed applications up to 10,000 rpm.
- Durability & Low Maintenance: Manufactured from chrome steel and featuring integrated seals, this pre-lubricated unit is built for long service life and requires minimal maintenance in clean environments.
S7021 ACD/P4ATBTB Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications requiring maximum rigidity and precision, including:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
